1 /* 2 * Copyright 2013 The LibYuv Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 // Get PSNR for video sequence. Assuming RAW 4:2:0 Y:Cb:Cr format 12 13 #ifndef UTIL_PSNR_H_ // NOLINT 14 #define UTIL_PSNR_H_ 15 16 #include <math.h> // For log10() 17 18 #ifdef __cplusplus 19 extern "C" { 20 #endif 21 22 #if !defined(INT_TYPES_DEFINED) && !defined(UINT8_TYPE_DEFINED) 23 typedef unsigned char uint8; 24 #define UINT8_TYPE_DEFINED 25 #endif 26 27 static const double kMaxPSNR = 128.0; 28 29 // libyuv provides this function when linking library for jpeg support. 30 // TODO(fbarchard): make psnr lib compatible subset of libyuv. 31 #if !defined(HAVE_JPEG) 32 // Computer Sum of Squared Error (SSE). 33 // Pass this to ComputePSNR for final result. 34 double ComputeSumSquareError(const uint8* org, const uint8* rec, int size); 35 #endif 36 37 // PSNR formula: psnr = 10 * log10 (Peak Signal^2 * size / sse) 38 // Returns 128.0 (kMaxPSNR) if sse is 0 (perfect match). 39 double ComputePSNR(double sse, double size); 40 41 #ifdef __cplusplus 42 } // extern "C" 43 #endif 44 45 #endif // UTIL_PSNR_H_ // NOLINT 46
